/*
    Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <wildfox@kde.org>
                  2004, 2005 Rob Buis <buis@kde.org>
                  2005 Eric Seidel <eric@webkit.org>
                  2010 Zoltan Herczeg <zherczeg@webkit.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    aint with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_FLOATPOINT3D_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_FLOATPOINT3D_H_

#include "flutter/sky/engine/platform/geometry/FloatPoint.h"

namespace blink {

class PLATFORM_EXPORT FloatPoint3D {
 public:
  FloatPoint3D() : m_x(0), m_y(0), m_z(0) {}

  FloatPoint3D(float x, float y, float z) : m_x(x), m_y(y), m_z(z) {}

  FloatPoint3D(const FloatPoint& p) : m_x(p.x()), m_y(p.y()), m_z(0) {}

  FloatPoint3D(const FloatPoint3D& p) : m_x(p.x()), m_y(p.y()), m_z(p.z()) {}

  float x() const { return m_x; }
  void setX(float x) { m_x = x; }

  float y() const { return m_y; }
  void setY(float y) { m_y = y; }

  float z() const { return m_z; }
  void setZ(float z) { m_z = z; }
  void set(float x, float y, float z) {
    m_x = x;
    m_y = y;
    m_z = z;
  }
  void move(float dx, float dy, float dz) {
    m_x += dx;
    m_y += dy;
    m_z += dz;
  }
  void scale(float sx, float sy, float sz) {
    m_x *= sx;
    m_y *= sy;
    m_z *= sz;
  }

  bool isZero() const { return !m_x && !m_y && !m_z; }

  void normalize();

  float dot(const FloatPoint3D& a) const {
    return m_x * a.x() + m_y * a.y() + m_z * a.z();
  }

  // Sets this FloatPoint3D to the cross product of the passed two.
  // It is safe for "this" to be the same as either or both of the
  // arguments.
  void cross(const FloatPoint3D& a, const FloatPoint3D& b) {
    float x = a.y() * b.z() - a.z() * b.y();
    float y = a.z() * b.x() - a.x() * b.z();
    float z = a.x() * b.y() - a.y() * b.x();
    m_x = x;
    m_y = y;
    m_z = z;
  }

  // Convenience function returning "this cross point" as a
  // stack-allocated result.
  FloatPoint3D cross(const FloatPoint3D& point) const {
    FloatPoint3D result;
    result.cross(*this, point);
    return result;
  }

  float lengthSquared() const { return this->dot(*this); }
  float length() const { return sqrtf(lengthSquared()); }

  float distanceTo(const FloatPoint3D& a) const;

 private:
  float m_x;
  float m_y;
  float m_z;
};

inline FloatPoint3D& operator+=(FloatPoint3D& a, const FloatPoint3D& b) {
  a.move(b.x(), b.y(), b.z());
  return a;
}

inline FloatPoint3D& operator-=(FloatPoint3D& a, const FloatPoint3D& b) {
  a.move(-b.x(), -b.y(), -b.z());
  return a;
}

inline FloatPoint3D operator+(const FloatPoint3D& a, const FloatPoint3D& b) {
  return FloatPoint3D(a.x() + b.x(), a.y() + b.y(), a.z() + b.z());
}

inline FloatPoint3D operator-(const FloatPoint3D& a, const FloatPoint3D& b) {
  return FloatPoint3D(a.x() - b.x(), a.y() - b.y(), a.z() - b.z());
}

inline bool operator==(const FloatPoint3D& a, const FloatPoint3D& b) {
  return a.x() == b.x() && a.y() == b.y() && a.z() == b.z();
}

inline bool operator!=(const FloatPoint3D& a, const FloatPoint3D& b) {
  return a.x() != b.x() || a.y() != b.y() || a.z() != b.z();
}

inline float operator*(const FloatPoint3D& a, const FloatPoint3D& b) {
  // dot product
  return a.dot(b);
}

inline FloatPoint3D operator*(float k, const FloatPoint3D& v) {
  return FloatPoint3D(k * v.x(), k * v.y(), k * v.z());
}

inline FloatPoint3D operator*(const FloatPoint3D& v, float k) {
  return FloatPoint3D(k * v.x(), k * v.y(), k * v.z());
}

inline float FloatPoint3D::distanceTo(const FloatPoint3D& a) const {
  return (*this - a).length();
}

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_FLOATPOINT3D_H_
